How do I make the plant extend its main stem?

I transplanted it a while ago and I put it low, hoping it would stretch more and I could add more earth, but she seems to stay short and bushy. I did the obvious and I placed it further from the 300w light. It was 9 inches and I dont know what it is now. She's an amnesia haze autoflower. Also, does she look heathy? Thanks.

It looks healthy. But you will need to get more soil in there. There really is no benefit of using a pot that tapers in like that at the bottom, you are robbing it of root real estate for no reason. If it was me I would transplant or just take it out and fill with soil below.

It will stretch more as it gets older, especially in flower. It looks like an indica dominant strain so the short spacing is normal at this stage.

It looks healthy. But you will need to get more soil in there. There really is no benefit of using a pot that tapers in like that at the bottom, you are robbing it of root real estate for no reason. If it was me I would transplant or just take it out and fill with soil below.

It will stretch more as it gets older, especially in flower. It looks like an indica dominant strain so the short spacing is normal at this stage.

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It's actually sativa dominant. Amnesia haze. And i will probably transplant it into a grow bag but how would I do it without disturbing the roots too much? Also, the pot doesnt taper that much, its only an illusion caused by the angle.

Transplanting is pretty easy. Even if she doesn't stretch. Gently wedge your hand between the base of the plant and the soil, flip the pot upside down. And gravity should help you get it out of the pot. Just partially fill the grow bag with soil, so that the plant will rest above the top of the grow bag. I try to transplant around when I would water the plants. I also don't give nutrients on the first day in the new larger pot.

one trick for easy repotting is to do it right before you water, the soil being dry in the pot makes it slip out a lot easier.
moving your light as far away as you can and still get results from it will help get a plant stretching. you can move it closer again once it starts to take off. also, the kelvin number of the light you are using will effect how much the plant stretches. the lower (redder) the number, the more it will promote stretching.

one trick for easy repotting is to do it right before you water, the soil being dry in the pot makes it slip out a lot easier.
moving your light as far away as you can and still get results from it will help get a plant stretching. you can move it closer again once it starts to take off. also, the kelvin number of the light you are using will effect how much the plant stretches. the lower (redder) the number, the more it will promote stretching.

use straight sided pots, and fill them up, dump some dirt into the pot before you put your plant in it, so the bottom leaves are a couple of inches above the rim of the pot. mix in about 30% perlite to your medium. if you're using a peat based medium, you probably want to ph at around 6.3.
peat retains water pretty well, so make sure they're drying out good between waterings.
you can get perlite at almost any big box like lowes or home depot. walmart will carry it in the summer.
if you have a place to store it, get the big 2 cubic foot bags, its cheaper that way, and it don't go bad